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It may BE losing fuel pressure, Robert. Check the fuel pressure and flow rate at the fuel rail. Filter, plugs, and cap have nothing to do with fuel pressure - your fuel pump and pressure regulator are the only things that can change fuel pressure very much.

It might not be getting enough fuel due to a dirty fuel filter, air filter or a failing fuel pump. I'd try a new fuel filter & air filter first then check out the pressure on the fuel pump. You may also have injector problems.
Good luck.

First check the pressure at the fuel rail at the top of the engine with a fuel pressure gauge these ar fairly expensive for what they are about a 100$ so if you can borrow one it would be great. doing this ensures you truly have low fuel pressure instead of a sensor or electrical problem. If the pressure is low, Id start with the easiest cheapest thing first should be the fuel filter if it is in line, if its in the fuel pump itll be harder, might think about doing both pump and filter at same timeif this is your case, also theres a fuel pressure regulator located at begging of fuel rail should be about forty dollars but easy to replace. fuel pumps generally just die and dont loose pressure, It is rare for a fuel pump to lose pressure so id replace it last.

No fuel pump reset switch on a Jimmy. If your pressure goes up to normal, then drops back down after 2 seconds, you need a new fuel pump as the return is not working correctly to keep fuel in the lines.

Your choises are...bad fuel pump, restricted fuel filter (new?) bad fuel pressure regulator...out of gas....can you pinch off the return fuel line to the tank? some are rubber and some are hard plastic...dont pinch the plastic. This will give you the unregulated pump pressure. If it doesn't go up you have a bad pump or it's drawing air from the tank (pick up restricted/fell off or no fuel) if pressure goes way up and runs good your regulator is bad